could entail
Regular verb: entail - entailed- entailed

Affirmation 	
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I could entail
you could entail
she could entail
we could entail
you could entail
they could entail 	I could be entailing
you could be entailing
she could be entailing
we could be entailing
you could be entailing
they could be entailing	I could have entailed
you could have entailed
she could have entailed
we could have entailed
you could have entailed
they could have entailed	I could have been entailing
you could have been entailing
she could have been entailing
we could have been entailing
you could have been entailing
they could have been entailing	

Negation 	
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I could not entail
you could not entail
she could not entail
we could not entail
you could not entail
they could not entail 	I could not be entailing
you could not be entailing
she could not be entailing
we could not be entailing
you could not be entailing
they could not be entailing	I could not have entailed
you could not have entailed
she could not have entailed
we could not have entailed
you could not have entailed
they could not have entailed	I could not have been entailing
you could not have been entailing
she could not have been entailing
we could not have been entailing
you could not have been entailing
they could not have been entailing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I entail?
could you entail?
could she entail?
could we entail?
could you entail?
could they entail? 	could I be entailing?
could you be entailing?
could she be entailing?
could we be entailing?
could you be entailing?
could they be entailing? 	could I have entailed?
could you have entailed?
could she have entailed?
could we have entailed?
could you have entailed?
could they have entailed? 	could I have been entailing?
could you have been entailing?
could she have been entailing?
could we have been entailing?
could you have been entailing?
could they have been entailing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not entail?
could you not entail?
could she not entail?
could we not entail?
could you not entail?
could they not entail? 	could I not be entailing?
could you not be entailing?
could she not be entailing?
could we not be entailing?
could you not be entailing?
could they not be entailing? 	could I not have entailed?
could you not have entailed?
could she not have entailed?
could we not have entailed?
could you not have entailed?
could they not have entailed? 	could I not have been entailing?
could you not have been entailing?
could she not have been entailing?
could we not have been entailing?
could you not have been entailing?
could they not have been entailing?